Compute similarity between columns in a fast manner MATLAB -


given (rather) big matrix :

 [m*n] (m = 7, n = 15000)

where columns items , rows attributes, compute similarity between each 2 items , store in array. similarity matrix sim each row contains [item1_id,item2_id, similarity]. process needs done fast.

i considering options @bsxfun uses multi-threading purpose. others ideas appreciated (i totally open other efficient approaches). appreciated if suggest approaches , report timing takes perform operation. process may scaled in future.

thank much.


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